An evaluation of Re, as an alternative to Pt, for 1-bar loop technique: an experimental study at 1400oC

Borisov, A.; Jones, J.H.

Авторы: Borisov A., Jones J.H.
Журнал: American Mineralogist
Том: 84
Год издания: 1999
Издательство: Mineralogical Society of America
Местоположение издательства: United States
Первая страница: 1528
Последняя страница: 1534
Аннотация: Previous workers have shown that, at high pressure, Re is a good capsule material and that iron loss to Re under these conditions is minimal (e.g., Herzberg and Zhang, 1997). We present here the first systematic low pressure study of Re loop stability and of iron loss from silicate melts to Re loops as a function of oxygen fugacity. Experiments were performed at 1400°C and one bar pressure over a range of fO2. For oxygen fugacities as low as QFM-2, iron loss was found to be negligibly small, even for a charge/loop ratio of only about 2. According to our calculations, for the same conditions, iron loss to a Pt loop could reach 70% of the initial FeO content. We have also estimated the diffusion coefficient of Fe in Re and found it to be very small (10-12 cm2/sec), which is an additional factor in preventing iron loss. At fO2’s near QFM, Re metal reacts to form volatile Re oxides. But at fO2 below QFM-1.7 Re loops were found to be stable for any reasonable experimental run duration at 1400°C. At lower temperatures it may be stable to even higher fO2’s. These conditions are similar to or slightly more reducing than the accepted redox states for the mantles of the Earth and Mars. Consequently, for many experiments, Re may be a more convenient loop material than Pt.
Добавил в систему: Борисов Александр Александрович

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An evaluation of Re, as an alternative to Pt, for 1-bar loop technique: an experimental study at 1400oCстатья

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